/*
 * Copyright (c) 2009 Piotr Piastucki
 * 
 * This file is part of Patchca CAPTCHA library.
 * 
 *  Patchca is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU Lesser General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *  
 *  Patchca is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU Lesser General Public License for more details.
 *  
 *  You should have received a copy of the GNU Lesser General Public License
 *  along with Patchca. If not, see <http://www.gnu.org/licenses/>.
 */
package com.jrelax.third.captcha.filter.library;

import java.util.Random;

public class DiffuseImageOp extends AbstractTransformImageOp {

	double[] tx;
	double[] ty;
	double amount;

	public DiffuseImageOp() {
		amount = 1.6;
	}

	public double getAmount() {
		return amount;
	}

	public void setAmount(double amount) {
		this.amount = amount;
	}

	@Override
	protected synchronized void init() {
		tx = new double[256];
		ty = new double[256];
		for (int i = 0; i < 256; i++) {
			double angle = 2 * Math.PI * i / 256;
			tx[i] = amount * Math.sin(angle);
			ty[i] = amount * Math.cos(angle);
		}
	}

	@Override
	protected void transform(int x, int y, double[] t) {
		Random r = new Random();
		int angle = (int) (r.nextFloat() * 255);
		t[0] = x + tx[angle];
		t[1] = y + ty[angle];
	}

}
